TransformFeedback buffer binding

src/OpenGL/libGLESv2/Context.cpp

@@ -1096,6 +1096,18 @@ void Context::bindPixelUnpackBuffer(GLuint buffer)
 	mState.pixelUnpackBuffer = getBuffer(buffer);
 }
 
+void Context::bindTransformFeedbackBuffer(GLuint buffer)
+{
+	mResourceManager->checkBufferAllocation(buffer);
+
+	TransformFeedback* transformFeedback = getTransformFeedback(mState.transformFeedback);
+	
+	if(transformFeedback)
+	{
+		transformFeedback->setGenericBuffer(getBuffer(buffer));
+	}
+}
+
 void Context::bindUniformBuffer(GLuint buffer)
 {
 	mResourceManager->checkBufferAllocation(buffer);
@@ -1458,8 +1470,9 @@ bool Context::getBuffer(GLenum target, es2::Buffer **buffer)
 	case GL_TRANSFORM_FEEDBACK_BUFFER:
 		if(clientVersion >= 3)
 		{
-			UNIMPLEMENTED();
-			return false;
+			TransformFeedback* transformFeedback = getTransformFeedback();
+			*buffer = transformFeedback ? static_cast<es2::Buffer*>(transformFeedback->getGenericBuffer()) : nullptr;
+			break;
 		}
 		else return false;
 	case GL_UNIFORM_BUFFER:

src/OpenGL/libGLESv2/Context.h

@@ -492,6 +492,7 @@ public:
 	void bindCopyWriteBuffer(GLuint buffer);
 	void bindPixelPackBuffer(GLuint buffer);
 	void bindPixelUnpackBuffer(GLuint buffer);
+	void bindTransformFeedbackBuffer(GLuint buffer);
 	void bindUniformBuffer(GLuint buffer);
     void bindTexture2D(GLuint texture);
     void bindTextureCubeMap(GLuint texture);

src/OpenGL/libGLESv2/libGLESv2.cpp

@@ -461,7 +461,7 @@ void GL_APIENTRY glBindBuffer(GLenum target, GLuint buffer)
 		case GL_TRANSFORM_FEEDBACK_BUFFER:
 			if(clientVersion >= 3)
 			{
-				UNIMPLEMENTED();
+				context->bindTransformFeedbackBuffer(buffer);
 				return;
 			}
 			else return error(GL_INVALID_ENUM);
@@ -1777,6 +1777,12 @@ void GL_APIENTRY glDrawArrays(GLenum mode, GLint first, GLsizei count)
 
 	if(context)
 	{
+		es2::TransformFeedback* transformFeedback = context->getTransformFeedback();
+		if(transformFeedback && transformFeedback->isActive() && (mode != transformFeedback->primitiveMode()))
+		{
+			return error(GL_INVALID_OPERATION);
+		}
+
 		context->drawArrays(mode, first, count);
 	}
 }
@@ -1809,6 +1815,12 @@ void GL_APIENTRY glDrawElements(GLenum mode, GLsizei count, GLenum type, const G
 
 	if(context)
 	{
+		es2::TransformFeedback* transformFeedback = context->getTransformFeedback();
+		if(transformFeedback && transformFeedback->isActive() && !transformFeedback->isPaused())
+		{
+			return error(GL_INVALID_OPERATION);
+		}
+
 		switch(type)
 		{
 		case GL_UNSIGNED_BYTE: